MATLAB: Illegal use of the reserved keyword “methods” error in App Designer

endkeywordMATLABmissing

When I run my app in App Designer, I encounter the following error message:

     Illegal use of the reserved keyword "methods".

How can I fix this?

Best Answer

This error often pops up when an the "methods" keyword is reached before an "end" is expected for a previous loop or function. Check back through your code to make sure you are not missing any necessary "end" keywords.

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MATLAB: Do functions like “linkaxes” or “linkprop” work with uifigure in AppDesigner

As of MATLAB R2020a, the "linkaxes" and "linkprop" functionalities are not supported using uifigure in App Designer. Our development team has been notified of this enhancement, and will consider it for future releases of MATLAB.

In the meantime, starting in MATLAB R2020a, you can use regular Axes within App Designer, and both "linkprop" and "linkaxes" are fully supported by regular axes when used within App Designer. Note that, in order to create a regular axes in App Designer, you need to programmatically call the "axes" command. My recommendation is to create a panel in your App while designing your app, and then use that panel as the parent for the axes.

A simple example about how to use regular Axes in an app written in App Designer is as follows:

1. Create a new app.

2. Drag a panel into your app where you want your axes. Set the "Title" to empty to remove the title from the panel. You can also change the border if desired.

3. Add a new property called "Axes", as follows:

properties
    Axes matlab.graphics.axis.Axes
end

4. In the "Code View", create a new Callback for the the UIFigure's StartupFcn.

5. Add this code to the new "startupFcn" (please note that both the signature and the end of the function will be generated automatically by App Designer for you)

function startupFcn(app)
    app.Axes = axes(app.Panel);
end

You can then use "linkaxes" and "linkprop" on the app.Axes property.

MATLAB: Illegal use of reserved keyword

This looks like a portion of an App Designer app, and if it is that is indeed a classdef file. Looking at the end keywords, the last one before the methods line ends the function. There is no end ending the previous methods block. You can't start a methods block inside another methods block.

end the methods block that contains PLAYNOTE before starting another one for your private methods.

Best Answer

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MATLAB: Do functions like “linkaxes” or “linkprop” work with uifigure in AppDesigner

MATLAB: Illegal use of reserved keyword

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